Update screen.orientation to follow the latest version of the specs.

LayoutTests/fast/dom/Window/resources/window-property-collector.js

Index: LayoutTests/fast/dom/Window/resources/window-property-collector.js
diff --git a/LayoutTests/fast/dom/Window/resources/window-property-collector.js b/LayoutTests/fast/dom/Window/resources/window-property-collector.js
index 1bdbce2de7a24a485c44327a1474a627593cecb3..2e2f0a6a070d2c01ed9e7a7948616306e924a23f 100644
--- a/LayoutTests/fast/dom/Window/resources/window-property-collector.js
+++ b/LayoutTests/fast/dom/Window/resources/window-property-collector.js
@@ -60,6 +60,9 @@ function emitExpectedResult(path, expected)
     case "navigator.vendor":
         expected = "window." + propertyPath;
         break;
+    case "screen.orientation":
+        expected = "'portrait-primary'";
+        break;
     }
 
     insertExpectedResult(path, expected);